The Thiessen polygon method is used to mark the functional region boundaries. This method was used in the USA to identify the rainfall region. There is a unique property of the Thiessen polygon that there is only one node in each polygon. The following three steps were used to mark the boundaries of the region.
Step-1:
Identify the major function nodes' location over geographical areas for finding the functional region of nodes. In the below figure, A, B, and C are the functional node of geographical areas.
Step-1
Step -2:
Connect all nodes with the line. In the below figure, Triangle ABC will form by connecting the functional notes of A, B, and C.
Step -2
Step -3:
Mark the middle point of the line AB, BC, and CA.
step-3
Step-4:
Create the longitudinal line from the middle point from each edge. The intersection of all these longitudinal lines will create one center node.
step-4
Step-5:
Connect the line starting from the center node ( i.e "O") to the middle note of each edge and extend it up to geographical boundaries (marking A1, B1, and C1). A polygon drawn from connecting to this longitudinal line in which only one node should be there is called Theissen polygon.
step 5
Finally:
The functional region of A will be the area of A1OC1.
The functional region of B will be the area of A1OB1.
The functional area of C will be the area of C1OB1
Uses of Theissen polygon:
In land-use planning
Identifying the functional area of hospitals, Schools, Shopping malls, cities, etc.
Rainfall pattern area identification
Try to solve the following questions.
What is a ‘region’? Describe the ‘Thiessen’ polygon method of regional delimitation. (2016, 15 marks)
Griffith Taylor town classification UPSC
Taylor's classification of town is based on the age, land use & development of the city. As pe
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